I know a 28 year old girl who died of heart failure in her sleep this month. I just found out today. She was having some pains and they were doing tests. Doctor gave her a new medicine to try and she went to sleep that night and never woke up. Her case wasn't normal, she had cardiac issues. But it's freaky. I'm talking to her a few weeks ago, she mentions that her doc can't isolate the problem with the tests they've done. Then she's just not here anymore.